Insulated armatu re-coil



(No Model.) I

J. H. SHUGG. INSULATED ARMATURE COIL.

No. 522.859. Patented July 10, 1894.

WITNEEIEEE [RS co. PNOTO-L\THQ..WASHINGTON u c UNITED STATES PATENTOrFicE.

JOHN H. SHUGG, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO THE GENERALELECTRIC COMPANY, OF NEW YORK.

INSULATED ARMATU RE-COIL.

SPECIFICATION forming partof Letters Patent No. 522,859, dated July 10,1894.

Application filed April 21, 1894:. Serial No. 508,402. (No model.)

To aldwhom it may concern:

Be it known that I, JOHN H. Sauce, a citizen of the United States,residing at Boston, county of Suffolk, and State of Massachusetts,

have invented certain new and useful Improvements in InsulatingArmature-Coils, of which the following isa specification.

My invention relates to the insulation of the coils of armatures fordynamo-electric to machines or motors, particularly to the machine-madecoils now often employed in such constructions. In armatures employingsuch coils, the core is generally slotted to admit of the reception ofpart of the coil and to avoid 1 the necessity for any projections ordriving horns for the coils, as well as for the magnetic effect. In manycases, these slots have been insulated from the body of the coil by anyappropriate insulating substance, such as mica or leatheroid, upon andwithin the slot itself. undesirable, because it renders it difficult toinsert the coil without distorting the insulation or impairing it moreorless. I therefore prefer to insulate the coil itself, irrespective ofany insulation that may be applied to the slot, so that it shall bethoroughly protected against accidental short circuit. To this end Ifirstform my coil by any of the now wellknown 3o mechanicalprocesses,such as those illustrated in the patent to Elihu Thomson, No.503,445, issued August 15, 1893, and to John B. Blood, No. 503,449,issued August 15, 1893, although I do not limit myself to this precisemethod; 55 after the coil is formed, it is immediately wrapped with asingle layer of tape, which binds its wires closely together, forming itinto an integral construction easy to manage and further manipulate. Ithen preferably apply shellac or Japan varnish to this tape, althoughthis is not imperative. After this I wrap the coil in oiled linen, andupon the oiled linen I wrap a further binding of tape, securing thelinen in place firmly and pro- This construction is somewhat.

tecting it against mechanical injury. The whole coil is then dipped inor painted with shellac or Japan varnish, and after being dried, isready for use. I thus form a coil which is thoroughly insulated, andwhich can be handled as if it were composed of a single wire, no matterhow many turns may enter into its construction; and at the same time itmay be bent or distorted toaccommodate it to the shape of the armaturewithout danger of impairing the insulation.

An embodiment of my invention is illustrated in the accompanyingdrawing, in which A is the coil, B, B are the terminals thereof,

0 the wires composing the coil, D the first 6o wrapping of linen tapebindingsuch wires together, E the layer of oiled linen, and F the finalwrapping.

I do not mean to limit myself to the precise details here shown, as thecoil might be of other shapes without affecting the scope of myinvention, and one or more layers of tape may be used, depending uponthe potential of the current in the armature in which the coil is to beemployed.

What I claim as new, and desire to secure by Letters Patent of theUnited States, is-

1. As a new article of manufacture an electric coil the conductors ofwhich are bound together and insulated by two layers of tape betweenwhich is interposed an oiled fabric.

2. As a new article of manufacture, a coil forthe armature of a dynamoelectric machine or motor, the wires of which are bound together withtape, and insulated with a layer ofoiled linen and an outsidewrapping oftape impregnated with an insulating varnish.

In witness whereof I have hereunto set my hand this 20th day of April,1894.

JOHN H. SHUGG.

Witnesses:

JOHN W. GIBBONEY, CLARA E. Goonwm.

